When the sudden urge to jizz is so overwhelming that you have to stop everything and have an emergency wank
Jesus Christ. I was at McDonald's drive-thru earlier when I had to abandon the car and run into the disabled toilets for an emergency wank. It was like I was possessed
Usually in a very stressful, indecisive situation one will decide to go have wank before making any vital decisions.
*Right before an exam*
Yo, Vlad, where are you going?
I am gonna go quickly to the bathroom!
To do what?
*whispers* To have an emergency wank, I cannot think straight, I need to let some steam off!
Alright, go ahead!